a) 2x ( x-5) -3 ( x 2 -2x ) + ( x-2) x = b) a ( a +b+c ) -b ( a-b+c ) -c ( a-b-c) = c) x ( x2 +2x + 1 ) - ( -4x3 + 8x2 - 6) : 2 = x2 = x to kwadratu -4x3 = -4x do szcześcianu 8x2 = 8x do kwadratu

a) 2x ( x-5) -3 ( x 2 -2x ) + ( x-2) x =2x^2-10x-3x^2+6x+x^2-2x=2x^2-3x^2+x^2-10x+6x-2x=2x b) a ( a +b+c ) -b ( a-b+c ) -c ( a-b-c) =a^2+ab+ac-ab+b^2-bc-ac-bc+c^2=a^2+b^2-2bc+c^2 c) x ( x2 +2x + 1 ) - ( -4x3 + 8x2 - 6) : 2 =x^3+2x^2+x-2x^3-4x^2+3=-x^3-2x^2+x+3